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Many system variables are dynamic and can be changed at runtime by using the SET statement. For a list, see Section 7.1.9.2, “Dynamic System Variables”. To change a system variable with SET, refer to it by name, optionally preceded by a modifier. At runtime, system variable names must be written using underscores, not dashes.
You can store a value in a user-defined variable in one statement and refer to it later in another statement. This enables you to pass values from one statement to another. User variables are written as @var_name, where the variable name var_name consists of alphanumeric characters, ., _, and $.
The REPLACE statement returns a count to indicate the number of rows affected. This is the sum of the rows deleted and inserted. If the count is 1 for a single-row REPLACE, a row was inserted and no rows were deleted. If the count is greater than 1, one or more old rows were deleted before the new row was inserted.
5 lis 2024 · The MySQL SET statements have various options for specifying how and when changes are made to system variables. It’s important to understand how these changes are reflected in current sessions (connections), later sessions, and after database server restarts. The variables that a specific user can change using SET are determined by their ...
This section lists server variables, status variables, and options that were added for the first time, have been deprecated, or have been removed in MySQL 8.4 since 8.0. Options and Variables Introduced in MySQL 8.4
7 maj 2024 · There is no default-authentication-plugin parameter in Mysql 8.4. You can get all mysqld parameters and description for --mysql-native-password as shown below. mysqld --verbose --help ... --mysql-native-password[=name] Enable or disable mysql_native_password plugin.
Like SET GLOBAL, SET PERSIST sets the global variable runtime value, but also writes the variable setting to the mysqld-auto.cnf file (replacing any existing variable setting if there is one).
